/**
 * Built-in measurement units shipped with the viewer.
 *
 * Five units are wired by default: millimetre, inch, point, pica,
 * agate. Hosts can pass any subset (or extend with their own custom
 * units) via the `units` prop on `MeasureTool`.
 *
 * Conversions are anchored to PDF points (1 pt = 1/72 inch). The
 * inch is exact (25.4 mm), so all derived units are deterministic.
 *
 * @public
 */
import type { MeasurementUnit } from "../plugin/types";
/**
 * Millimetre. The metric default for print workflows.
 *
 * @public
 */
export declare const mmUnit: MeasurementUnit;
/**
 * Inch. The U.S. print standard.
 *
 * @public
 */
export declare const inchUnit: MeasurementUnit;
/**
 * Point. The PDF coordinate-space native unit (1 pt = 1/72 inch).
 *
 * @public
 */
export declare const pointUnit: MeasurementUnit;
/**
 * Pica. Twelve points. Used in classical typography for body
 * widths and column gutters.
 *
 * @public
 */
export declare const picaUnit: MeasurementUnit;
/**
 * Agate. 5.5 points. Historical newspaper measurement for column
 * inches in classified ads.
 *
 * @public
 */
export declare const agateUnit: MeasurementUnit;
/**
 * The five built-in units in display order: mm, in, pt, pica,
 * agate. `MeasureTool` defaults to a subset (`defaultMeasurementUnits`)
 * for readability; consumers that want all five pass this array.
 *
 * @public
 */
export declare const allMeasurementUnits: ReadonlyArray<MeasurementUnit>;
/**
 * Default units shown by `MeasureTool` when no `units` prop is
 * supplied: mm, in, pt. The two old-school print units (pica,
 * agate) are available as opt-ins via `allMeasurementUnits` or
 * by passing them explicitly — the readout would otherwise get
 * cluttered for the common case.
 *
 * @public
 */
export declare const defaultMeasurementUnits: ReadonlyArray<MeasurementUnit>;
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